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  <title>Description of maskSphere</title>
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  <meta name="description" content="Creates an 'image' of a n-dimensional hypersphere.">
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<h1>maskSphere
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<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="box"><strong>Creates an 'image' of a n-dimensional hypersphere.</strong></div>

<h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="box"><strong>function mask = maskSphere( d, r, show ) </strong></div>

<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="fragment"><pre class="comment"> Creates an 'image' of a n-dimensional hypersphere.

 Useful for testing visualization procedures.

 Create a d-dimensional matrix mask of dimensions [s x s x s x ... x s]
 where s=2r+1.  Each element mask(x1,x2...,xd) is 1 if (x1,...xd) falls
 inside the centered hypersphere of rad r.

 In 1d this corresponds to a vector of the form [.. 0 1 1 1 1 1 0 ..]
 In 2d this corresponds to an image of a white circle.
 In 3d and 4d, well try it and 'see' what it looks like.
 
 USAGE
  mask = maskSphere( d, r, [show] )

 INPUTS
  d         - dimension (any positive integer)
  r         - sphere integer radius 
  show      - [] figure in which to display results

 OUTPUTS
  mask      - [s x s x s x ... x s] hypersphere image

 EXAMPLE
  mcircle = maskSphere( 2, 20, 1 );
  msphere = maskSphere( 3, 10, 2 );
  msphere = maskSphere( 4, 10, 3 );

 See also <a href="maskCircle.html" class="code" title="function mask = maskCircle( angleStart, angleSiz, r, nSamples )">MASKCIRCLE</a>, <a href="montage2.html" class="code" title="function varargout = montage2( IS, prm )">MONTAGE2</a>

 Piotr's Computer Vision Matlab Toolbox      Version 2.0
 Copyright 2014 Piotr Dollar.  [pdollar-at-gmail.com]
 Licensed under the Simplified BSD License [see external/bsd.txt]</pre></div>





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